Ciao,

It looks like empty menu. Go to that menu item settings and disable MegaMenu for it.

In reality, the main page of Portfolio still exists, only the under pages that were in the menu under menu have been eliminated so I do not care to eliminate the portfolio item from the mega menu but I am only interested in eliminating the shadow that appears from the mega menu when I click on Portfolio good evening

In that case, custom CSS is needed

#sp-menu  .sp-megamenu-parent .sp-dropdown .sp-dropdown-inner {
  box-shadow: none; }

i tried but nothing changed. when I open the portfolio menu there is always the trail of the bright shadow

I solved the problem. In the settings of the Template in the Mega Menu section I only eliminated the part of mega menu animations leaving the portfolio menu item. Have a nice weekend https://prnt.sc/8wbd8TkpKhM_

Oh, my mistake - I was thinking about submenu shadow.